1. To investigate whether giving chest-compression-only (CC)rather than standard cardiopulmonary resuscitation (CPR) to a heartattack patient will improve the victim's chance of surviving,researchers conducted 2500 trials. In each trial, the EMT presentrandomly assigned either CC or CPR at the site where a person hadjust experienced a heart attack. They found that of the 1,600 caseswhere CC had been given, 200 people had survived, whereas of the900 cases where standard CPR had been given, the number was180.
2. Identify the observational units. Choose one.
   1. Whether given CC or CPR instructions
   2. Whether heart attack victim survived or not
   3. Cases of heart attacks where emergency services werecontacted
   4. Those people who survived
3. Identify the explanatory variable. Choose one.
   1. Whether given CC or CPR instructions
   2. Whether heart attack victim survived or not
   3. Cases of heart attacks where emergency services werecontacted
   4. Those people who survived

1. Identify the response variable. Choose one.
   1. Whether given CC or CPR instructions
   2. Whether heart attack victim survived or not
   3. Cases of heart attacks where emergency services werecontacted
   4. Those people who survived

1. In this context, which of the following is an (are) appropriatestatistic value(s)? Choose all that apply.
   1. 200/1,600−180/900= -0.075
   2. 200/2500−180/2500= 0.008
   3. 200/1400−180/720= -0.107
   4. (200/1,600)/ (180/900) = 0.626

1. Which of the following is the appropriate null hypothesis?Choose one.
   1. Giving CC instructions is just as effective as giving CPRinstructions at saving lives of heart attack victims.
   2. Giving CC instructions is more effective than giving CPRinstructions at saving lives of heart attack victims.
   3. Giving CC instructions is less effective than giving CPRinstructions at saving lives of heart attack victims.

1. Which of the following is the appropriate alternativehypothesis? Choose one.
   1. Giving CC instructions is just as effective as giving CPRinstructions at saving lives of heart attack victims.
   2. Giving CC instructions is more effective than giving CPRinstructions at saving lives of heart attack victims.
   3. Giving CC instructions is less effective than giving CPRinstructions at saving lives of heart attack victims.
2. Use an appropriate randomization-based applet to find ap-value. Report and based on this p-value, what is theconclusion that we can get?
3. Use the 2SD method to find a 95% confidence interval for theparameter of interest. Report this interval and interpret theinterval in the context of the study.